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Find the mean:

Class interval: 50-70 70-90 90-110 110-130 130-150 150-170
Frequency: 18 12 13 27 8 22

1 Answer

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Best answer

Let’s consider the assumed mean (A) = 100

From the table it’s seen that,

A = 100 and h = 20

Mean = A + h x (\(\frac{Σf_i u_i}{N}\))

= 100 + 20 x (\(\frac{61}{100}\))

= 100 + 12.2

= 112.2

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